Cutter tool locking mechanism



Jan. 1, 1946. J. A. ANANIA 3 1 CUTTER TOOL LOCKING MECHANISM Filed Jan.18, 1945 Patented Jan. 1, 1946 U ITED STATES PATE T iii m v2,392,217 1 vv I I f CUTTER.TOOL LOCKING MECHANISM James A. Anania, Newark, J. IApplication January 18, 1945, Serial No. 573,380

2 Claims.

This invention relates to an improved cutter tool locking mechanism,being especially designed for use in connection with the cutter toolassembly disclosed in my copending application filed October 11, 1943,Serial Number 505,859.

In my improved cutter tool assembly mentioned, a tool holder is providedwith a rotatable cutter head having circumferentially spaced cuttersthereon and it is therefore necessary to lock the head in rotatablyadjusted position in order to render the several cutters selectivelyactive. Set bolts and other locking means have been tried for thepurpose but have not proven entirely satisfactory. A sliding,spring-retracted locking pin has also been tried but it has been foundthat unless the pin is provided with a rigid axial abutment, loosenesswill develop between the pin and head while the tool assembly is in use.

It is accordingly an object of the present invention to provide alocking mechanism wherein a sliding, spring-retracted locking pin forthe cutter head will be provided with a rigid axial abutment.

A further object of the invention is to provide a locking mechanismwherein the locking pin will be solidly supported at both ends thereof,and wherein the bushing employed for supporting the forward end of saidpin may be adjusted toward the forward working terminal of the pin toafford added rigidity thereto.

And a still further object of the invention is to provide a lockingmechanism embodying an axially disposed abutment rod for the lockingpin, wherein said rod will provide a rigid stop behind said pin, whereinthe rod may be manually adjusted for projecting the pin into engagementwith the cutter head or to permit the retraction of the pin, and whereinthe rod will be solidly supported at both ends thereof so as to preventany slight buckling or bending of the rod under end thrust of thelocking pin thereon.

Other and incidental objects of the invention will appear during thecourse of the following description, and in the drawing.

Figure 1 is a perspective view of my improved cutter tool assemblyequipped with the present invention.

Figure 2 is a vertical, longitudinal sectional view more particularlyshowing the details of the present locking mechanism.

Figure 3 is a fragmentary, horizontal section on the line 3-3 of Figure2.

Figure 4 is a transverse section on the line 4-4 of Figure 2.

In the drawing, I have shown my improved cutter tool assembly,previously identified,

equipped with the locking mechanism of the present invention. Brieflystated, said mechanism includes a tool holder having a shank l0 which isadjustable in the usual manner upon a tool post, as suggested in dottedlines in Figure 1, and formed on the shank is a fork ll. Rotatablyadjustable between the arm of the fork is a cutter head [2 having anumber of circumferentially spaced cutter rests l3 thereon, and seatedupon said rests are removable cutters M. In accordance with the presentinvention, the tip ends of the rests l3 are provided with sockets l5.

Formed through the shank I0 is a smooth, longitudinal bore l6, andscrewed into the forward end of said bore is a bushing ll. Slidablethrough said bushing is a locking pin 3 on the rear end of which isformed a circular head [9, and disposed between said head and thebushing is a spring 20 for retracting said pin and normally holding thepin retracted.

The forward end of the pin I8 is engageable in the sockets [5 of thecutter head l2 selectively and the head I!) is formed to snugly butslidably fit in the bore l6 so that the head will solidly support therear end of the pin while the bushing I! will solidly support the pin atits forward end portion. Furthermore, as will be observed, the bushingI! may, be adjusted forwardly in the bore l6 so that the forwardterminal of the bushing will lie closer to the forward terminal of thepin for affording added rigidity to the free end of the pin.

Screwed into the bore l6 of the shank ID at the rear end of said bore isa bushing 2|, and screwed through said bushing i an abutment rod 22disposed axially of the locking pin I8. At its forward end, the rod 22is provided with a circular head 23 which snugly but slidably as Well asrotatably fits in the bore l6 of the shank II] for solidly supportingthe forward end of the rod while the bushing 2| will solidly support therod at its rear end portion. Thus, any slight buckling or bending of therod under end thrust of the locking pin l8 thereon will be prevented.

The head 23 of the rod 22 seats fiat against th head IQ of the lockingpin I8 to provide a stop therefor, and pinned or otherwise removablysecured upon the rear end of said rod is a knob 24. Accordingly, as willbe seen, the rod 22 may be manually adjusted forwardly when the head 23of the rod will rotate against the head l9 of the locking pin l8 andproject the pin into one of the sockets l5 of the-cutter head l2. Arigid and solid lock for the head is thus provided, and, preferably, therod 22 is equipped with a lock nut bination of a tool holder having ashank, a cutter head rotatably adjustable upon the holder, a locking pinireely slidable upon the. shank and movable forwardly to engage at itsforward end with the head and lock the head in adjusted position.

and an abutment rod connecting the rear end of said pin to extendaxiallythereof and rotatably adjustable upon the shank for shifting saidpin forwardly. r 7 2. In a cutter tool locking mechanism'th'e com--bination of a tool holder having a shank provided with a boretherethroughracutter head rotatably adjustable upon the holder,abushing' mounted in the forward end of said bore, a locking pinslidable through said bushing and provided at its rear end with a headslidably fitting in said bore,

a spring disposed between saidif head and bushing and acting. to retractthe pin, ,a second bushing mounted in the rear end of said bore, and anabutment rod screwed through the latter bushing andprovided at itsforward end with a head rotatably fitting in'said bore to contact thehead of said pin, said rodbeing rotatably adjustable for sliding the pinforwardly to engage and lock the 215 hea'din adjusted position.

JAMES A. ANANIA.

